<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box{
            background-color: #f2f2f2;
            width: 300px;
            height: 200px;
            display: inline-block;
            border: thick orange solid;
            box-sizing: border-box;
            vertical-align: top;
            margin: 1rem;
            line-height: 200px;
            text-align: center;
        }
    </style>
</head>
<body>
    <h2>支持：IE9+ 浏览器</h2>
    <div class="box" style="border-radius: 10px;">border-radius: 10px;</div>
    <div class="box" style="border-radius: 10px 30px">border-radius: 10px 30px</div>
    <div class="box" style="border-radius: 10px 30px 60px">border-radius: 10px 30px 60px</div>
    <div class="box" style="border-radius: 10px 20px 30px 40px">border-radius: 10px 20px 30px 40px</div>
    <div class="box" style="border-radius: 50%">border-radius: 50%</div>
    <div class="box" style="border-radius: 20%">border-radius: 20%</div>
</body>
</html>